WN1877
WN1877 (Southwest Airlines) is a multi-stop service on 27 routes, busiest St Louis to Austin. Of 620 departures recorded from October 2024 to July 2026, 75.4% left on time, according to the US BTS.
- On-time departures75.4%of 620 flights
- Average delay12.7 min
- July 20264▼ 87.1%vs July 2025
- Cancelled1.1%
- Legs flown under this number27
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 30 | 31 | ▲ 3.3% |
| February | 36 | 25 | ▼ 30.6% |
| March | 32 | 23 | ▼ 28.1% |
| April | 30 | 28 | ▼ 6.7% |
| May | 28 | 28 | 0.0% |
| June | 31 | 7 | ▼ 77.4% |
| July | 31 | 4 | ▼ 87.1% |
| August | 42 | – | – |
| September | 43 | – | – |
| October | 39 | – | in progress |
| November | 28 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 218 | 146 | ▼ 33.0% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 89.3% | 64.5% | ▼ 27.7% |
| February | 83.3% | 56.0% | ▼ 32.8% |
| March | 78.1% | 47.8% | ▼ 38.8% |
| April | 90.0% | 67.9% | ▼ 24.6% |
| May | 67.9% | 39.3% | ▼ 42.1% |
| June | 80.0% | 85.7% | ▲ 7.1% |
| July | 73.3% | 75.0% | ▲ 2.3% |
| August | 90.5% | – | – |
| September | 81.0% | – | – |
| October | 67.6% | – | in progress |
| November | 82.1% | – | – |
| December | 72.4% | – | – |
| Year-to-date average (Jan–Jul) | 80.3% | 62.3% | ▼ 22.4% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 2 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 1 | 0 | ▼ 100.0% |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 1 | – | – |
| October | 2 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 4 | 0 | ▼ 100.0% |
according to the US BTS · October 2024 → July 2026
This is a historical record of departures already flown, not a forecast for your flight.
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 98.9% 613
- Cancelled 1.1% 7
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 25, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| STL AUS St. Louis Lambert International Airport – Austin Bergstrom International Airport | 1,161 | 8.4 min | 86.1% | 117 |
| JAX BWI Jacksonville International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,068 | 13.4 min | 78.0% | 61 |
| SJC AUS Mineta San Jose International Airport – Austin Bergstrom International Airport | 2,372 | 10.7 min | 76.3% | 59 |
| DAL PHX Dallas Love Field – Phoenix Sky Harbor International Airport | 1,412 | 9.3 min | 87.8% | 50 |
| SJC MDW Mineta San Jose International Airport – Chicago Midway International Airport | 2,950 | 23.0 min | 42.9% | 42 |
| STL PHX St. Louis Lambert International Airport – Phoenix Sky Harbor International Airport | 2,026 | 15.7 min | 78.8% | 33 |
| LGA DAL LaGuardia Airport – Dallas Love Field | 2,219 | 32.7 min | 72.4% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 19 | 19 | 84.2% | 0 |
| November 2024 | 28 | 28 | 85.7% | 0 |
| December 2024 | 28 | 28 | 89.3% | 0 |
| January 2025 | 30 | 28 | 89.3% | 2 |
| February 2025 | 36 | 36 | 83.3% | 0 |
| March 2025 | 32 | 32 | 78.1% | 0 |
| April 2025 | 30 | 30 | 90.0% | 0 |
| May 2025 | 28 | 28 | 67.9% | 0 |
| June 2025 | 31 | 30 | 80.0% | 1 |
| July 2025 | 31 | 30 | 73.3% | 1 |
| August 2025 | 42 | 42 | 90.5% | 0 |
| September 2025 | 43 | 42 | 81.0% | 1 |
| October 2025 | 39 | 37 | 67.6% | 2 |
| November 2025 | 28 | 28 | 82.1% | 0 |
| December 2025 | 29 | 29 | 72.4% | 0 |
| January 2026 | 31 | 31 | 64.5% | 0 |
| February 2026 | 25 | 25 | 56.0% | 0 |
| March 2026 | 23 | 23 | 47.8% | 0 |
| April 2026 | 28 | 28 | 67.9% | 0 |
| May 2026 | 28 | 28 | 39.3% | 0 |
| June 2026 | 7 | 7 | 85.7% | 0 |
| July 2026 | 4 | 4 | 75.0% | 0 |